1 definition by Lemonade_company

Top Definition
An erection caused by someone you're not supposed to be attracted in the first place, eg, teachers, cousins, hot aunty, your best friend's mom or your best friend.
'Dammit, your second cousin is freaking hot.'
'i know, she gives me forbidden boner all the time'
by Lemonade_company January 21, 2012

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